code: def on_resize(self, event):
      self.activate_zoom()
  
file_path: vispy/examples/demo/gloo/voronoi.py
imports: import numpy
  from vispy import app
  from vispy import gloo
label_desc: Use image node_id 3 for calling the Canvas obj's underlying member method code with example usage: obj.on_resize(event) without return types